Step-by-Step Guide to Program VW Audi MQB49 5D Key with KEYDIY KD-X4

If you're a professional locksmith or an automotive enthusiast, mastering the art of key programming is essential. This comprehensive guide outlines how to add a VW Audi MQB49 5D key using the KEYDIY KD-X4 programmer. Follow these safety and technical steps closely to ensure successful key programming.

Required Equipment

• KEYDIY KD-X4 5-in-1 Key Programmer
• KEYDIY KD-X4 8-pin Adapter Board
• Target 5D transponder key blank
• Original vehicle key (equipped with a 5D chip)
• Soldering tools and connecting wires

Software/Firmware Requirements

Ensure your devices are updated to the following versions:

• KEYDIY Mobile App: Version 8.7.1 or higher
• KD-X4 Firmware: Version 1.53 or higher

Step-by-Step Instructions

1. Connect Your Device

Begin by opening the KEYDIY app on your mobile device. Activate Bluetooth and pair with the KD-X4 unit by navigating to:

• Bluetooth Settings → KD Remote Control Devices

Confirm the connection is successful under “Paired Devices.”

2. Navigate to Functions

On the app's home screen, tap “Immo Programming.” Follow the steps below:

• VOLKSWAGEN → Select by Type → 5C/5D Immobilizer System → Start Execution.

3. Begin the Key Programming Process

Select “Read the original car key and generate a dealer key.” The app will provide a detailed wiring diagram. Adhere to this diagram carefully.

4. Set Up Wiring Connections

Using the on-screen diagram:

• Connect wires to the three designated pins on the top row of the adapter board (front side).
• Make two additional connections as outlined in the app.
• Solder the wires from the adapter board to the corresponding pads on the key blank’s PCB.

Double-check all connections to ensure accuracy.

5. Read Original Key Data

Insert the original vehicle key into the adapter socket and tap “Read Chip Data.” Upon success, a unique Service Code will be generated. Record this code for future reference.

6. Program the New Blank Key

Keep all wiring in place and insert the new key blank into the adapter. In the software, select “Original Key (Non-Vehicle).” Note that the “KD ZB Smart Key” option supports only 5C chips; for 5D keys, follow this explicit procedure.

Start the write process. A confirmation message of “Write successfully” indicates that the key blank has been programmed correctly.

7. Match Key to Vehicle Immobilizer

Carefully disconnect all wiring and reassemble the newly programmed key. Next, proceed to the vehicle and utilize either:

• KD – X4’s built-in “Key Learning” function, or
• An external KD – Mate key programmer.

Follow the on-screen instructions to synchronize the new key with the immobilizer system; both new and original keys will be needed. Be aware that for 2024+ model-year vehicles, unlocking SFD (Secured Feature Deactivation) may be necessary before key learning.

8. Verify the Results

Finally, check if the newly programmed key successfully starts the vehicle’s engine. If it does, congratulations! You have completed the key programming process.